Who developed the first emergency medical standards in the United States?

The development of the first emergency medical standards in the United States can be attributed to the U.S. Department of Transportation (DOT). In the 1960s, the DOT recognized a growing need for standardized training and protocols for emergency medical services, particularly in relation to pre-hospital care and transportation of patients.

The DOT established guidelines that led to the creation of the National Standard Curriculum for Emergency Medical Technicians, which laid the groundwork for EMT training and practice across the country. This initiative was significant in promoting uniformity in emergency medical services, ensuring that EMTs were trained to provide consistent and quality care during emergencies.

The other organizations listed have played important roles in various aspects of emergency medical services; however, the DOT's specific focus on standardizing emergency medical practices makes it the correct answer in this context.